Planning to Fail

We've all heard the cliche "if you fail to plan, you might as well plan to fail." Now comes this sobering piece from Overcoming Bias, by way of 43 Folders on The Planning Fallacy, "a common cognitive bias... which is a repeatable, documented error in thinking that apparently explains why we all tend to underestimate task-completion times."

This should be required reading for project managers, developers, business managers, sales professionals, students... Hell, it should be required reading for everyone.